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She may have been ordered to serve 90 days in the slammer, but Lindsay Lohan probably won't stay behind bars for that long.

Steve Whitmore, a spokesperson for the Los Angeles Sheriff's Department, tells Access Hollywood that generally non-violent females, such as the 24-year-old actress, are eligible to serve just 25 percent of their sentence. In Lohan's case, that would wind up at around 22 days. The reason: Severe jail overcrowding.

However, it remains unclear whether the judge will forbid an early release.

Three years ago, the actress served just 84 minutes of a 24-hour sentence at the women's Century Regional Detention Facility in Lynwood, Calif. She will likely report to the same facility July 20 when she is required to surrender.

And don't expect Lohan to get heckled by other inmates, either: She'll probably be held in seclusion, away from the general population, for her safety.

That's what happened to Paris Hilton in 2007. She was sentenced to 45 days in jail for violating the terms of her probation by repeatedly driving with a suspended license. She ended up serving 23 days.